Probing the isothermal (delta)->(alpha)' martensitic transformation in Pu-Ga with in situ x-ray diffraction

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The time-temperature-transformation (TTT) curve for the {delta} {yields} {alpha}{prime} isothermal martensitic transformation in a Pu-1.9 at. % Ga alloy is peculiar because it is reported to have a double-C curve. Recent work suggests that an ambient temperature conditioning treatment enables the lower-C curve. However, the mechanisms responsible for the double-C are still not fully understood. When the {delta} {yields} {alpha}{prime} transformation is induced by pressure, an intermediate {gamma}{prime} phase is observed in some alloys. It has been suggested that transformation at upper-C temperatures may proceed via this intermediate phase, while lower-C transformation progresses directly from {delta} to {alpha}{prime}. To investigate ... continued below

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Jeffries, J R; Blobaum, K M; Schwartz, A J; Cynn, H; Yang, W & Evans, W J March 11, 2010.

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The time-temperature-transformation (TTT) curve for the {delta} {yields} {alpha}{prime} isothermal martensitic transformation in a Pu-1.9 at. % Ga alloy is peculiar because it is reported to have a double-C curve. Recent work suggests that an ambient temperature conditioning treatment enables the lower-C curve. However, the mechanisms responsible for the double-C are still not fully understood. When the {delta} {yields} {alpha}{prime} transformation is induced by pressure, an intermediate {gamma}{prime} phase is observed in some alloys. It has been suggested that transformation at upper-C temperatures may proceed via this intermediate phase, while lower-C transformation progresses directly from {delta} to {alpha}{prime}. To investigate the possibility of thermally induced transformation via the intermediate {gamma}{prime} phase, in situ x-ray diffraction at the Advanced Photon Source was performed. Using transmission x-ray diffraction, the {delta} {yields} {alpha}{prime} transformation was observed in samples as thin at 30 {micro}m as a function of time and temperature. The intermediate {gamma}{prime} phase was not observed at -120 C (upper-C curve) or -155 C (lower-C curve). Results indicate that the bulk of the {alpha}{prime} phase forms relatively rapidly at -120 C and -155 C.

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PDF-file: 13 pages; size: 11 Mbytes

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  • Presented at: MRS 2010 Spring Meeting: Actinides Symposium, San Francisco, CA, United States, Apr 05 - Apr 09, 2010

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  • Report No.: LLNL-PROC-425667
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 978406
  • Archival Resource Key: ark:/67531/metadc931856

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  • March 11, 2010

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  • Nov. 13, 2016, 7:26 p.m.

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  • Dec. 7, 2016, 7:05 p.m.

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Jeffries, J R; Blobaum, K M; Schwartz, A J; Cynn, H; Yang, W & Evans, W J. Probing the isothermal (delta)->(alpha)' martensitic transformation in Pu-Ga with in situ x-ray diffraction, article, March 11, 2010; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc931856/: accessed October 20, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.